Electric sterilizing-oven.



N. DEDRiCK ELFCTRIC STERILIZING OVEN.

APPLscATloN FILED ras. 5. 191s.

1,213,163. K v Patented Jan.23,11917.

' GGOOOBPOOGQQOOOGOO600000060 ii UNITED STATES PATENT OFFICE.

NICHOLAS DEDEICH, or MANITCWCC, WISCONSIN, AssIGNon 'ro CARL H. sEEGEn,or

MANITCWCC, wIsCoNsIN.

ELECTRIC STEBILIZING-OVEN.

Specification of Letters Patent.y

Patented Jan. 23, 1917.

Application :filed February 5, 1916. Serial N o. 76,2775.

To all whom it may concern.'

yBe it known that I, NICHOLAS DEDRICK, a

v citizenl of the United States, and resident of description thereof.

nal vertical sectional view through the im- The present inventionrelates to new and useful improvements in electric heating devices andis more particularly directed to the provision of a sterilizing ovenadapted for use in sterlizing dental or surgical instruments althoughvarious features of the invention may find application in otherconnections.

It is an object of the present invention to provide an eicient andcomparatively simple sterilizing oven for the purpose above specified,and it is further an object to provide heat re ulating means associatedtherewith where y various desired degrees of heat may be maintained inthe oven.

Another object resides in the provision of such a sterilizing ovenwherein the heating member thereof may be readily detached from the bodyportion and wherein the heating member, when associated therewith, isefficiently protected from possible accidental ,.damage.

A still further object resides in the provision of an improved heatingmember for the oven wherein provision is made for an exceedinglyrapidheating and wherein heat is properly distributed through the oven inlthe various heating operations of `the mem- Withthe above and otherobjects and adivantages in view, vthe invention resides moreparticularly 1n thev novel combination, ar-

rangement andformation of parts more particularly hereinafter describedand particularly pointed out in the appended claims. In the drawings:Figure 1 is a longitudiproved oven on the line' 1-1 of Fig. 2. Fig. 2 isa transverse sectional view taken through the oven on the line 2 2 ofFig. 1. Fig. 3 isl a plan view of the improved heating block, .withportions thereof broken away in section. Fig. 4 is a detail sectionalview on the line 3-3 of Fig. 2.

Referring now more particularly to the accompanying drawings, the bodyportion of the oven comprises side and end walls 5 and 6 respectivelyeach comprising a pressed metal casing provided with a filler ofsuitable heat insulating quality, and this body is supported by legmembers 7 having angular securing flange portions 8 Xed in the bottomcorner portions of the body. A suitable cover 9 is hinged to one of theside walls f 5 and is formed preferably in a manner similar to theformation ofthe side walls.` Y

The bottom portionof the oven is detachably connected with the bodyportion described and comprising a panshaped member l0 adapted to litwithin the bottom of the body vand to bear against a continuous flangeme'mber l2 projecting inwardly from the walls of the body, this panniember being secured in place by screws 13 passed through the bottomedge portions of the walls and through its flange portions. -The bottomof the pan member carries a heat'insulating plate 14 and in each cornerofthe pan member is provided a spacing block 15 each cut away in itsinner upper corner tc fit a second plate 16 which is thus held spacedfrom the sides of the pan and from the bottom plate 14. Carried on thisplate 16 is the heating block 17 which is of a width slightly greaterportions 12 and which is of a height substantially equal to the distancebetween the flange portions and the plate 16 on which it is positionedwhereby the block may abut the flange portions of the side walls and oneend`wall, the block beingspaced from the other end Wall to provide forthe thermostat chamber later to be described. kThis heating block ispreferably .formed of `asbestos or similar material and is provided witha plurality of longitudinal openings 18, there being eight openings inthe present instance, and in each pair of adjacent openings 18 ispositioned respective coils 19 of a double coil element, the ends ofrespective coils being connected adjacent the end of the block farthestfrom the thermostat chamber, and the other ends of the coils beingextended for attachment with the thermostat structure.

`The sides of the pan member at its end farythan the distance betweenopposite flange vented due to the fact that such air must pass eitherunder the plate 16 or through the passages of the heating block.

Taking up now the thermostat structure, an upstanding metallic plate`21is carried by the end of the-plate 16 adjacent the spaced end of thethermostat block and this plate includes a plurality of, andin thisinstance four upstanding linger portions through the upper end of eachof which is threaded a contact screw 22 and carried by the plateadjacent each `nger portion is a thermostat bar 23 which is preferablysecured to and insulated from the plate by pairs of upper and lowerbolts 24 and 25 respectively with which are associated suitableinsulation members 26. The upper bolts 24 also carry a bar 27 to whichis secured a wire extending from each of the double coil heatin elementsand the lower bolts 25 comprise indingl posts to which are attached the4other wires of the said heating elements. Carried by the bar 27 whichis as noted disposed inwardly of the plate 20 is a binding post 28extending through the plate 21 without lcontact therewith and connectedby a suitable connection 29 with a pin member 30 adapted to beassociated with a conventional electric plug member, another pin 31being connected directly to the plate 21 by a conne'ction 32. Thus acircuit is provided for each heating element including the plug pin 30,theI bar 27, the said heating element, a respective thermostat bar 23,the plate 21 and the other plug pin 31.

By providing a plurality of thermostat members in conjunction with theheatingY elements a comparative nicety of adjustment for variousdesiredheats maintained in the oven may be had by adjustment of the contactscrews 22 to provide for their respective thermostat bars breakingcontact atvarious heats. Y A

One of the 'heating elements is preferably of such heating power as tomaintain a proper sterilizing heat within the oven, and thus in theordinary use of the device one of the contact screws 22 is so associatedthat its contact'with the respective thermostat bar will not be brokenat that desired temperature and the other screws are arranged so thattheir contacts will be broken upon reaching that temperature. Fordetermining the temperature within the oven, the end'wall thereof,opposite the thermostat structurev has a portion outwardly oifset andpassed Y through. and secured in this oifset portion is the laterallyturned end of a thermometer 33 of conventional type.

ifmsncs vided for carrying the various instruments to be sterilized.

Thus there has been provided a comparatively simple and exceedingly.efficient sterilizing oven particularly adapted for sterilizing dentalor surgical instruments, and wherein a variety of degrees of heat may beprocured.

I claim:

1. An electric sterilizing oven comprising a body formed of heatinsulating material, a foraminous partition disposed horizontally in thebody, and terminatmg at one end in an upstanding wall portion spacedfrom the adjacent end of the bodyto form a thermostat chamber, a heating`member disposed below the partition and including a plurality ofelements and thermostats in the chamber for controlling respectiveelements.

2. `An electric sterilizing oven comprising a body including side andend walls, a cover and a bottom, an inwardly projecting horizontalflange at the lower portions of said side and end walls, a heatingmember resting against said flange and spaced from the bottom and fromone end of the body, and the body being provided with openings between ythe heating member and bottom.

f and one end wall, and the sides and the adjacent end of the bottom panmember being provided with open-ings communicating with the heatingblock passages.

ln testimony that l claim the foregoing VI have hereunto set my hand atManitowoc,

in .the county of Manitowoc and State of Wisconsin, in the presence oftwo witnesses.

NICHOLAS nEDnroK. Witnesses E. L. PLEUss, H. A. ELFNER.

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